Tìm x

Bài 8: tìm x

a) x + 10 = 20

b) 2 . x + 15 = 35

c) 3 ⋅ ( x + 2 ) = 15

d) 10 . x + 15 . 11 = 20 . 10

e) 4 . ( x + 2 ) = 3 . 4

f) 33 x + 135 = 26 . 9

g) 2 . x + 15 + 16 + 17 = 100

h) 2 . (x + 9 + 10 + 11) = 4 . 12 . 25